From ddf2a6a1168dc558c3cf5a0997ae84cdc4937a98 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Mon, 6 May 2019 03:57:28 -0400
Subject: [PATCH] Don't mock HTTP requests for resource:// or chrome:// URLs

---
 chrome/content/zotero/xpcom/http.js | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/chrome/content/zotero/xpcom/http.js b/chrome/content/zotero/xpcom/http.js
index 18be915d46..99f05d4504 100644
--- a/chrome/content/zotero/xpcom/http.js
+++ b/chrome/content/zotero/xpcom/http.js
@@ -264,9 +264,8 @@ Zotero.HTTP = new function() {
 		
 		var deferred = Zotero.Promise.defer();
 		
-		if (!this.mock) {
-			var xmlhttp = Components.classes["@mozilla.org/xmlextras/xmlhttprequest;1"]
-				.createInstance();
+		if (!this.mock || url.startsWith('resource://') || url.startsWith('chrome://')) {
+			var xmlhttp = new XMLHttpRequest();
 		}
 		else {
 			var xmlhttp = new this.mock;